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Reading from VPD is supported by StatisticsProvider so IMO we can reuse
the code. There will be a follow-up Chrome OS CL to deal with writing
to VPD specifically.

Bug: 820783
Change-Id: I57de7212ca3b5366731789f0836ab5c6fcca294f
Reviewed-on: https://chromium-review.googlesource.com/969942
Commit-Queue: Wenzhao (Colin) Zang <wzang@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Roger Tawa <rogerta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545659}